Sometime in 2009 I did a post on the Smiths racing tachometer, the ATRC tachometer, badged Smiths and coded ATRCxxxx...
It has generated interest over the intervening years and I've manufactured a few more as a result of the post.
so lets have another look at this instrument that carries this A.T coding...
They are characterised by the pointer rotating through a slot in the instrument dial with the pointer blade sweeping the surface of the dial rather than from completely above it as in other speedometers made by smiths and other manufacturers.
The A.T Speedometer Company Ltd of 140 Long Acre, London WC was advertising in "Flight" magazine in July 1915 so they are one of the originals in automotive,motorcycle and aviation instrumentation....
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Sometime around 1927-1930 Smiths Motor Accessories acquired the firm and they were manufactured in Chronos Works, North Circular Road, London N.W.2...
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Their speedometers had been in Rolls Royce cars since the 1920's and in Bentley cars from 1933....
Lets have a peruse of a 1934 A.T. catalogue to view the items they made.
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In the early 1950's Smiths responded to the demand for a racing tachometer without the inherent lag of the chronometric principled tachometer and introduced the ATRC version....see my 2009 post on this.
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Following are examples of car and lorry dashboards from around 1955 which utilise the A.T. versions Smiths made.
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It has generated interest over the intervening years and I've manufactured a few more as a result of the post.
so lets have another look at this instrument that carries this A.T coding...
They are characterised by the pointer rotating through a slot in the instrument dial with the pointer blade sweeping the surface of the dial rather than from completely above it as in other speedometers made by smiths and other manufacturers.
The A.T Speedometer Company Ltd of 140 Long Acre, London WC was advertising in "Flight" magazine in July 1915 so they are one of the originals in automotive,motorcycle and aviation instrumentation....
Lets have a peruse of a 1934 A.T. catalogue to view the items they made.
Following are examples of car and lorry dashboards from around 1955 which utilise the A.T. versions Smiths made.
Smiths AT speedometer from a Leyland bus....
During 1964,1965 Smiths made industrial versions of the A.T. Tachometer available also....
As mentioned I did a posting in 2009 and this discusses the principle of operation of the A.T instrument and is useful to assist....
Finally, Smiths made hand held industrial tachometers to measure rotating shaft speeds etc and these of the A.T principle.....
They often had multiple scales altered by a knob on the case....
